<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link href="./dest/test.css" media="screen" rel="stylesheet" type="text/css" />
</head>
<body>
    <div class="top">
        top
    </div>
    <div class="bottom">
        <div class="left">
            <div>1</div>
            <div>2</div>
            <div>3</div>
        </div>
        <div class="center">
            <div>1</div>
            <div>2</div>
        </div>
        <div class="right">
            <div>1</div>
            <div>2</div>
        </div>
    </div>

</body>
</html>